A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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1answer
50 views

Extract by Mask rasters don't line up with original features in ArcGis 9.3

I have 3 features I'm trying to use to extract by mask a DEM raster layer. After I extract by mask the layers visually don't line up. When I try to do further analyses (e.g., extract to point, slope, ...
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1answer
201 views

Openlayers3 using custom EPSG:25832

I want to use EPSG:25832 as the default projection for all my layers. The projection is not working correctly because the Position (center point) should be in Germany but I end up in France. When I ...
4
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2answers
155 views

Merging rasters in QGIS?

I have 3 modis tiles that I want to merge together. They were all reprojected in the same CRS (from sinusoidal to WGS84 UTM zone 32 N), but I cannot succeed. I have tried with merge and virtual ...
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0answers
81 views

Calculating distances with lat/long in decimals and WGS 84

I need to calculate the distance between points of two different datasets, once with locations of towns, the other with locations of dams. Both are located in different countries in Africa. The more ...
3
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2answers
169 views

Ukrainian topographic map: projection and coordinates?

I need some help. I managed to get Ukrainian topographic maps for my project. I'd like to do the georeferencing in QGIS. The problem is that I don't have a clue what projection was used and how to ...
4
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0answers
53 views

How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing ...
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0answers
76 views

Changing CRS units from meters to kilometers in QGIS

I have shape files with CRS of SWEREF99 with +proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs The units are all in meters but I prefer to make a map with coordinates in ...
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0answers
50 views

Do locations “move” when shifting datum?

I hope that this is the right Stack Exchange for this question. I may be oversimplifying this, but I'm looking for verification in my understanding of the following: If I have a spatial dataset in 2 ...
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0answers
28 views

Coordinate system for South and North America together?

I am working on project where i need south and north america together and i search for the best coordinate system. I have choosen wgs 1984 but distortion in north part is very big.
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1answer
32 views

Converting entire map to UTM 18 if only interested in part that is in UTM 18?

I am using some polygons and rasters whose initial extents cover all of Canada or all of North America. I am interested in a small area in Ontario that is in UTM zone 18. I would like to use the UTM ...
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1answer
27 views

CRS problems with SwtMapPane

I'm quite new to geotools and I'm trying to get to grips with it. Trying to load some shapefiles (see attachment) into a MapContent which in turn is associated with a SwtMapPane I always get an ...
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1answer
24 views

Layers not overlapping in QGIS? [duplicate]

I downloaded a bunch of wpts from my gps. I converted them to .SHP format with a CRS WGS 84 in QGIS, and started a new project. I then exported some satelite imagery from the internet as a tiff and ...
0
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1answer
95 views

Convert SQL Server spatial table with unknown coordinate reference system to GeoJSON with ogr2ogr

I have a table in SQL Server with an STSrid of 0. I would like to convert this table to GeoJSON using ogr2ogr. The problem is, despite converting to EPSG:4326, the resulting coordinates are not valid ...
1
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2answers
69 views

QGIS, indoor map with relative coordinates

i am trying to create an indoor map with relative coordinates where the bottom left hand corner of the map is (0, 0), and the CRS is UTM, so the distance between coordinates is in meters. previously ...
2
votes
1answer
54 views

QGIS: Changing CRS and losing GPX track

I have a simple project — a base map and a gpx track. The basemap is from OpenLayers. I want to change the map the CRS to Arizona Central so I can use miles as units for QChainage. When I change ...
3
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1answer
58 views

How to unit test distance calculation beetween to points?

I want to write unit test for this query select a.id, b.id from channel a, channel b where ST_Distance_Spheroid( a.coordinates, b.coordinates, 'SPHEROID["WGS 84",6378137,298.257223563]' ) ...
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0answers
21 views

Layer is too small compared to rest of map? [duplicate]

I do apologize I am very new when it comes to this, this is my first GIS class. So I have one layer like this And I am trying to add another layer, but it is extremely small and placed in the ...
1
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1answer
22 views

Comparing Coordinate Reference Systems in GeoTools

This seems like a pretty silly problem. I'm using a Maven build with GeoTools 14.0. All I want is to compare CRSs with flexibility so that it doesn't have to be exactly equal as long as all the ...
1
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1answer
34 views

How to calculate areas for data that covers the whole of Australia [duplicate]

I have a polygon shapefile showing mining areas across all of Australia. I want to calculate the area for each of the polygons however they have been provided in a Geographic Coordinate System ...
5
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1answer
168 views

How do you check if two feature classes have the same spatial reference?

Using arcpy, how do you check if two feature classes have the same spatial reference? Just checking if the two are equal doesn't work: >>> import arcpy >>> fc1 = ...
1
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1answer
96 views

NAD 1983 Illinois State Plane- not projecting correctly

I'm having trouble with CAD drawings not projecting correctly within ArcMap 10.2. I am working in NAD 1983 State Plane Illinois East FIPS 1201 (US Feet) and want my CAD drawing to be located in the ...
0
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1answer
14 views

Scale and density values in density map appear wrong when in projected coordinate system?

I'm making a series of maps illustrating different aspects (road density, location of dams, elevation etc...) of a single watershed in California. In most of my maps, I've had the projection set to ...
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0answers
51 views

QGIS Server & custom CRS

I'm using QGIS Server and an OpenLayers-based web client (in EPSG:3857). I have a QGIS project that I want to serve with QGIS Server, containing layers in several CRS, including custom ones. ...
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4answers
501 views

Batch conversion of XY coordinates to latitude and longitude

I'm working on a school project. I have this dataset from Sacramento, California http://data.cityofsacramento.org/search/?q=police I want to convert the XY coordinates to latitude and longitude, in ...
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0answers
34 views

Transform itrf96 to web mercator 900913 proj4s

I am using cached basemap tiles with itrf96. proj4 version is like this: Spatial Reference Page +proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=500000 +y_0=0 +ellps=GRS80 +units=m +no_defs I want to ...
0
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0answers
56 views

How to use Esri custom geographic transformation in FME Desktop 2015 Workbench?

I am trying to reproject DWG files from one projection system to other using a custom transformation created by me with ArcGIS. When I execute it reprojects the data but does not use the custom ...
0
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0answers
34 views

Which projection system should I use to have my layers over Google Maps as basemap?

I am using Openlayers 3 with Google Maps in javascript to have my custom layers over a Google Maps basemap. My layers are in Projection EPSG:4326 (WGS 84), but are not falling in place on the ...
1
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1answer
68 views

How can I create custom projected coordinate system in arcpy?

I want to create my own projected coordinate system based on one of geographical coordinate systems and set custom values to properties as longitude, scaleFactor etc. I found SpatialReference class. ...
7
votes
2answers
215 views

What is the difference between spatialreference.org catalogs: EPSG, ESRI, and User-defined?

I'm trying to understand EPSG codes. I've been to the spatialreference.org site, and in its "about" link, it states: "There are currently three distinct catalogs of spatial reference systems on this ...
0
votes
1answer
157 views

Why do pyproj and matplotlib basemap produce different results when they convert my lat-long data into a CRS?

pyproj and matplotlib basemap seem to produce differing x-y values when they convert my lat-long data into the same CRS (such as Albers Equal Area). These x-y values tend to be off by hundreds of ...
0
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0answers
31 views

Is it safe to query for points contained within polygons using a lat-long projection?

I'm querying for points contained within a polygon. All data - both points and polygons - is stored in latitudes and longitudes. Technically I should probably project this data to a suitable local ...
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0answers
21 views

Should I set the projection if the data has already been projected?

I need to plot some data which was produced on a native grid with a lambert conformal conic projection. I need to create a geotiff (using python and gdal) and was wondering how to go about and do ...
1
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0answers
31 views

Querying for points within polygon in MySQL?

I have polygon in this format POLYGON(23.816364700000001 87.574939799999996 ,23.814872699999999 87.572279100000003 ,23.812595399999999 87.572279100000003 ,23.809925700000001 87.571678300000002 ...
4
votes
1answer
44 views

Can Irish points be accurately represented by British OS Grid references?

I'm currently working in a database which stores mainland British locations as their Ordinance Survey Northing/Easting values. Can points in Ireland (primarily Northern Ireland) be accurately ...
1
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0answers
51 views

problem with area calculation in QGIS

I encountered a problem in QGIS 2.10.1 when I tried to calculate the areas of polygons in a polygon layer. I followed the instructions here ...
2
votes
1answer
103 views

Map opening in Indian Ocean on QGIS Web Client?

After installing web part of qgis i created a project with layers. All layers are working, but i always need to scroll the map to reach these layers. How can I open the map exactly there i want? I ...
0
votes
1answer
190 views

Projection error, geotransform not valid

I am trying to extract data from gridded weather datasets such as GLDAS from pixels in which weather stations are located. I created an ArcGIS shapefile of weather station points. These ...
0
votes
1answer
43 views

What is most accurate Spatial reference system for calculate Area entire world [duplicate]

I want to know what Spatial reference system is most accurate to calculate area? I want to use it for entire world (-180,+180,-90,+90 area in WGS84 system) I have every thing ok I only need to ...
0
votes
1answer
27 views

Ways to make distances more apparent

I have made this map: The intention of the map is to make it clear that the distances is shorter from Luleå than from Rome. As you can see that is not the case here. Which ways are there to make ...
0
votes
2answers
73 views

Coordinates transformation

I have the following data base with information about rainfall for a set of meteorological stations: year station latitude longitude depto municipio date rainfall 1990 11010010 0527 N ...
1
vote
1answer
42 views

How to display coordinate-system properties of raster data in FME Data Inspector?

FME Data Inspector shows detailed information of coordinate-system properties of vector data sets (marked in green). But for raster data sets FME displays in the status bar only basic information ...
0
votes
2answers
176 views

How to convert projected coordinates to geographic coordinates without ArcGIS? [closed]

I'm trying to convert a series of points from Easting Northing to LatLong, I have this working perfectly in Arc but ideally I would like the algorithm to do it through our own system. It is a huge ...
2
votes
1answer
33 views

Representing coordinates on non-earth globes in semantic data

There are standards to represent geospatial data in the context of linked data, such as GeoSPARQL. However, I could not find a way to represent the coordinates that are not on Earth - such as, for ...
1
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1answer
53 views

CRS changes even though set in project

I am slightly confused as to why when i am working in projects the CRS changes when I add new data, e.g. add Bing maps or try to georeference an image. The CRS is set in the project and when I am ...
0
votes
1answer
56 views

Trying to find Coordinate System for Dubai?

I have a CSV file to convert .shp. The X,Y values are like X -40219075 Y 200946341 This is somewhere in Dubai area. Can any one tell me what will be the coordinate system they used for this?
2
votes
2answers
124 views

projection conversion from local to UTM

I have some images at a local coordinate system with the following specifications: TIFF header file: -gdalinfo im.tif Driver: GTiff/GeoTIFF Coordinate System is: PROJCS["Eastern Ridge Project Grid ...
0
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0answers
29 views

Using GDAL to ID a pair of GeoTiff Coordinates

I've got a large library of images with no spatial reference. When I view the GeoTiff properties, I can view a lat/long under a "GPS" heading, but there's no indication of a coordinate ...
0
votes
1answer
48 views

Offset after projection from WGS84 to ETRS1989

I'm using ArcMap 10.3, my dataframes coordinate system is "ETRS_1989_UTM_Zone_32N_6Stellen". I have several shapefiles in my project which are using the WGS84 system. When I try to proct them to ...
1
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0answers
61 views

Strategies and methods that Datums and Coordinate Systems use to account for movement of the earth's surface

Are there datums and coordinate systems that address the issue of shifting coordinates through time? If so, what are some of the strategies and methods that the datums and coordinate systems use to ...
2
votes
1answer
64 views

Issue rendering polygons at global scale when using the Robinson coordinate reference system in QGIS 2.10

I am trying to create a map using the Robinson coordinate reference system (EPSG:54030) in QGIS 2.10, on Mac. I used the 'on the fly projection' feature in the Project Properties. My base layer is a ...